The nicest home-hosted events I’ve been to have been the ones where the hosts were relaxed and convivial.
As a guest you don’t want to tiptoe on eggshells with a stressed host (don’t over stretch yourself - frozen roast potatoes won’t let you down as much as getting snappy or you and your dh hissing at each other). Have a few jobs that a guest can help with if they offer, but don’t expect or depend on help.
A guest wants it to be clear where they’re supposed to stand/sit, what you expect of them, where the bathroom is (make sure there’s spare loo roll and clean towels). Some need time outs so let everyone know what time you’re serving up at in case anyone nips out for a walk, and leave a jigsaw puzzle or a giant crossword out.
Have a think about particular needs. If Uncle Joe has a bad hip, providing a dining chair among the armchairs might be welcome. Have sweetener available for the diabetic’s tea. Great Granny might need a seat at the table where she can easily get to the loo etc.
Are you comfortable enough cooking to be able to squeeze in an unexpected request for chicken nuggets? Dc might need some extra snacks to keep them going before lunch. Set up a film to watch after dinner when the adults want to relax or have seconds.
For the other days, I’d keep breakfast and lunch simple - buffet of toast/cereal and sandwiches/soup. Organise some events - easily done via WhatsApp but not everyday. And go with the flow.
In every bedroom, leave bottled water, the WiFi password, and spare linen. Make sure there’s a bedside light and place to charge phones. Extra blankets. I leave a hot water bottle on the first night too.
I keep a spares box for guests with various things they might have forgotten.
Catch up on your own laundry before anyone arrives, and then do a load every day. Remember that a house can look chaotic and be tidied up again in 10-15 minutes. Don’t refuse offers to wash up!
After all that I’d look at decorations -window garlands with timed fairy lights are lovely and won’t be in anyone’s way but they’re a little bit of cheer for the bedrooms.
And see if there are any special attractions in your area - it’s lovely to do something local.